3781231 has 4 divisors (see below), whose sum is σ = 3826872. Its totient is φ = 3735592.

The previous prime is 3781229. The next prime is 3781237. The reversal of 3781231 is 1321873.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3781231 - 2¹ = 3781229 is a prime.

It is a super-2 number, since 2×3781231² = 28595415750722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3781196 and 3781205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22696 + ... + 22861.

It is an arithmetic number, because the mean of its divisors is an integer number (956718).

Almost surely, 2^3781231 is an apocalyptic number.

3781231 is a deficient number, since it is larger than the sum of its proper divisors (45641).

3781231 is an equidigital number, since it uses as much as digits as its factorization.

3781231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45640.

The product of its digits is 1008, while the sum is 25.

The square root of 3781231 is about 1944.5387627918. The cubic root of 3781231 is about 155.7917311679.

The spelling of 3781231 in words is "three million, seven hundred eighty-one thousand, two hundred thirty-one".